You've got a UIF file from a friend and have no clue how to use it on your Mac? No need to go and boot up your old Windows PC (if you still have one). Just drop the file into UIF2ISO for Mac and it will convert it into a standard ISO format. The ISO you can just use with OSX. Open it. Burn it.

who the hell wants to use that program if the only needed thing to use UIF files is to RENAME the extension from UIF to ISO... after renaming the extension you can use it perfectly without an problem as an ISO file